Compensating spring take-up tension for bobbin change shuttles



p 9, 1952 c. H. DURHAM 2,609,843

COMPENSATING SPRING TAKE-UP TENSION FOR BOBBIN CHANGE SHUTTLES Filed June 15, 1951 CHARLES 1% DURHAM A Ila/"nay Patented Sept. 9, 1952 ooMrENsATmo SPRING TAKE-UP TENSION FOR BOBBIN'CHANGE SHUTTLES N Charles H. Durham, Bedford, Va.-

Application June 15,1951, SerialNo. 231,736 1 5 Claims.

1 a This invention relates to a novel spring talzeup-tension? capable of being readily applied to a standard tension of the type commonly used 1 in bobbin change shuttles and which will effectively take upanyslacl: in the yarn or filling when the shuttle strikes the picker, to thereby eliminate serious defects nowresulting in woven cloth where no means is provided by thereonventional tension for taking up slack andmaintaining uniform tension on the fillinga Another object of the inventionis toprovide a compensating spring take-up tension for use as an attachment for a conventional tension which will maintain an even tension at all times on the filling andwhich may be employed with any type of yarn and with modern high-speed loom shuttles.

Various other objects and advantages of the invention will hereinafter become more fully apparent .from the following description of the drawing, illustrating a presently preferred embodiment thereof, and wherein:

Figure 1 is a fragmentary plan view of the for ward and of a shuttle showing the invention applied to a conventional tension;

Figure 2 is a side elevational View thereof looking from bottom to top of Figure 1;

Figure 3 is a top plan view of a conventional tension equipped with the invention and shown removed from the shuttle;

Figure 4- is a side elevational view looking from bottom to top of Figure 3;

Figures 5 and 6 are horizontal sectionalviews taken substantially along planes as indicated by the lines 55 and 6-6, respectively, of Figure 4;;

Figure '7 is an end elevational view looking from right to left of Figure 4;

Figure 8 is a side elevational view looking from right .to left of Figure '7;

Figure 9 is a cross sectional view takensubstantially along a plane as indicated by thevline @--9 or Figure 4, and

Figure 10 is an enlarged exploded perspective view illustrating certain of the parts of the invention.

Referring more specifically to the drawing, the forward portion of a shuttle body, designated generally Iii, of conventional construction is shown in Figures 1 and 2. The shuttle H) has the usual cavity H in which is disposed a conventional bobbin !2 carrying the filling or yarn l3. The forward end or nose Id of the shuttle I!) is provided with the usual depression I5 which opens into the forward end of the cavity II, is open at its top and opens outwardly of one side of the nose I4, as seen at I5. The de- 2 pression I5 is of the proper shape and size to accommodate a conventional tension Ill which is detachably secured therein by a fastening l8.

The tension ll has a channel [9 through which the yarn extends forwardly and said tension is provided with the usual opposed spring urged pads 29 which extend into the channel l9 and between which the yarn :[3 passes. The pads 20 grip the yarn to resist movement thereof away from the bobbin IE but afford no means for tal ing up any slack in the portion of the yarn which extends outwardly through the cavity opening it. The parts previouslydescribed are all of conventionalconstruction. V

The compensating spring take-up tension, designated generally 2| and comprisingthe invention, constitutes a unit which is detachably mounted in the tension ['1 and which functions therewith. For this purpose the body of the tension ll is provided with a slot 22 which is disposed substantiallyparallel to its bottom surface to loosely accommodate a lever 23 which is mounted for swinging movement in the slot 22 by amaze which extends loosely through the V inner end of said lever 23 and perpendicularly through the slot 22. The body of the tension I1 is also provided with a bore 25 which is disposed in the same plane as the slot 22- and has one end opening into said slot and its opposite end opening outwardly of a sidewall 25 of the tension body. As best seen in Figure 4, a plate?! is secured against the wall '25 by a screw fastening 28 and overlies the end ofthe bore-25 which opens outwardly of said side wall to form a stop for one end of an expansion coiled spring 29 which is disposed in the bore 25. A headed pin 343 has its shank portion extending into the opposite end of the spring 29 and its head portion bearing against the said last mentioned spring end and against anedge of the lever 23 forurging the lever 23 toswing counterclockwise about its pivot 2 as seen inFigure 6, A stop pin 3| is secured in the tension body H and extends perpendicularly through the slot 22 and is enceives the upper end of the rod 32 and in which said upper end is slidably guided when the lever '23 is swung on its pivot 24. A yarn guide pin 31 extends outwardly and downwardly from the front wall 34, remote to the position of the lever 23 when the latter is held against the pin 3| and abuts a part of the shuttle nose M to close the upper part of the cavity opening I6.

From the foregoing it will be readily apparent that all of the elements constituting the compensating spring take-up tension are demountably supported by the tension body I! with only slight modifications thereof so that the tension body, with the attachment 2|, may be readily mounted in a conventional manner in the depression [5, as illustrated in Figures 1 and 2, and secured therein by the fastening [8 which extends through an opening 3110f the tension body.

The yarn or filling I3 extends forwardly from the bobbin l2 longitudinally through the channel 19, between the yieldably gripping pads 20 and thence forwardly, as illustrated in Figure 1, around the upstanding rod 32 and then laterally beneath the ledge 33 and pin 31 and outwardly through the opening I 6. Whereas the pads 20 of the conventional tension merely resists movement of the yarn through the tension from the bobbin I2, the attachment 2| additionally functions to take up slack in the portion of the yarn or filling 13 which has passed outwardly through the opening I6 and which is in no way accomplished by the conventional tension I1. When the shuttle I is operating in a conventional manner in a loom, not shown, the pull on the end of the yarn which extends from the opening [6 will exert a sufiicient pressure against the rod 32 to cause the lever 23 to be swung clockwise on its pivot 24 to its position as shown in dotted lines in Figure 6 against or substantially against the inclined wall 39 of the slot 22 to thereby compress and load the spring 29. Consequently, when the shuttle I0 strikes the loom picker, not shown, slack will occur in the portion of the yarn which has passed outwardly through the opening l6 and the spring 29 will expand to swing the lever 23 back towards its full line position of Figure 6 to thereby take up this slack and tension the yarn to eliminate serious defects in the woven cloth, which would-otherwise occur, such as rough cloth, and willlikewise prevent kinking of the filling, loose picks and backlashes. The attachment 2| may be utilized with any type of yarn or filling to maintain a uniform tension at all times thereon and is especially adapted to modern high-speed looms. V

It will also be apparent that the shuttle body l0 requires no modification for use of the attachment 2! with a conventional tension.

Various modifications and changes are contemplated and may obviously be resorted 'to, without departing from the spirit or scope of the invention as hereinafter defined by the appended claims.

' slot and an opposite end projecting outwardly from a front wall of the tension body, a pivot pin extending through the first mentioned lever end and anchored in the tension body for swingably mounting the lever in said slot, an expansion spring disposed in said socket and urging the lever to swing in one direction, said tension body having a ledge portion overlying and extending outwardly from its front wall and provided with an arcuate guide groove in its under surface, and a rod fixed to and rising from the last mentioned, outer end of said lever having an upper end slidably engaging said guide groove, said rod being adapted to have the yarn or filling engaging around its outer side for exerting a pressure on the lever to swing the lever in the slot and against the action of the spring for normally maintaining the spring in a loaded condition whereby the lever is swung under the biasing action of the spring when slack occurs in the yarn for tensioning the yarn.

2. A device as in claim 1, and. a stop pin extending perpendicularly through the said slot and engaged by the lever when swung by the biasing action of the spring.

3. A device as in claim 1, and stop means disposed against a wall of the tension body and forming the opposite, closed end of the socket.

4. A device as in claim 3, said stop means comprising a plate and means for detachably fastening said plate to said last mentioned wall, said plate being removable for opening the last mentioned socket end to remove and apply the spring.

5. A device as in claim 1, and a headed pin having a shank portion disposed in the spring and a head portion disposed against one end of the spring and against a portion of said lever.

CHARLES H. DURHAM.

REFERENCES CETED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

